Address msvc2019 warning C4018: '<': signed/unsigned mismatch

src/sbbs3/js_socket.c

@@ -2811,7 +2811,7 @@ js_listening_socket_constructor(JSContext *cx, uintN argc, jsval *arglist)
 			free(protocol);
 			return JS_FALSE;
 		}
-		for (i = 0; i < count; i++) {
+		for (i = 0; (jsuint)i < count; i++) {
 			if (!JS_GetElement(cx, obj, i, &v)) {
 				lprintf(LOG_WARNING, "Unable to get element %d from interface array", i);
 				continue;